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Lizzie Olsen is this year's "It" Girl

Lizzie Olsen is this year's "It" Girl

Lizzie Olsen at Sundance Channel HQ. A week ago, Elizabeth “Lizzie” Olsen was just another 21-year-old senior at NYU who happened to have two very famous half-sisters: the TV-movie-fashion-and-overall-marketing phenomenon known as Mary Kate and Ashley. This week, thanks to the Sundance Film Festival, where she’s starring in two much-buzzed about films (MARTHA MARCY MAY…